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Lysine Iron Agar

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Lysine Iron Agar Technical Specification Sheet Lysine Iron Agar (NCM0140) Intended Use Lysine Iron Agar is used for the differentiation of microorganisms on the basis of lysine decarboxylase and hydrogen sulfide production. Lysine Iron Agar is not intended for use in the diagnosis of disease or other conditions in humans. Description Lysine Iron Agar is prepared according to the formulation of Edwards and Fife, who developed the medium to detect Salmonella arizonae. S. arizonae ferments lactose rapidly, and the authors found expected H2S production on Triple Sugar Iron Agar was suppressed. Detection of S. arizonae is important because it has been implicated in food borne infections. By eliminating lactose and incorporating lysine, Edwards and Fife devised a medium differentiating enteric bacilli based on their ability to decarboxylate or deaminate lysine and produce abundant hydrogen sulfide. This medium is recommended for detecting rapid lactose-fermenting S. arizonae. Typical Formulation Enzymatic Digest of Gelatin 5.0 g/L Yeast Extract 3.0 g/L Dextrose 1.0 g/L L-Lysine 10.0 g/L Ferric Ammonium Citrate 0.5 g/L Sodium Thiosulfate 0.04 g/L Bromocresol Purple 0.02 g/L Agar *13.5 g/L *10 -15 g according to gel strength Final pH: 6.7 ± 0.2 at 25°C Formula may be adjusted and/or supplemented as required to meet performance specifications. Precaution Refer to SDS Preparation 1. Suspend 33 g of the medium in one liter of purified water. 2. Heat with frequent agitation and boil for one minute to completely dissolve the medium. 3. Dispense into test tubes and autoclave at 121°C for 15 minutes. 4. After autoclaving, allow medium to solidify in a slanted position. Test Procedure 1. Inoculate medium by stabbing base of tube butt and streaking slant with a needle. 2. Loosely cap the tube to ensure aerobic conditions. Incubate at 35°C for 18 - 48 hours. 3. Examine at 18 – 24 and 40 – 48 hours for growth and color changes in tube butt and slant, and for blackening at the apex of slant. Quality Control Specifications Revision: 1 Effective Date: 11/20/2019 Dehydrated Appearance: Powder is homogeneous, free flowing, and gray to gray-beige. Prepared Appearance: Prepared medium is reddish purple and trace to slightly hazy. Technical Specification Sheet Expected Cultural Response: Cultural response on Lysine Iron Agar at 35 ± 2°C after 18 – 48 hours Incubation. Microorganism Approx. Response Reactions Inoculum (CFU) Slant Butt H2S Citrobacter freundii ATCC® 8090 Direct Inoculation Growth K A + Escherichia coli ATCC® 25922 Direct Inoculation Growth K K --- Proteus mirabilis ATCC® 29906 Direct Inoculation Growth R A --- Salmonella typhimurium ATCC® 14028 Direct Inoculation Growth K K + Shigella sonnei ATCC® 25931 Direct Inoculation Growth K A --- The organisms listed are the minimum that should be used for quality control testing. KEY: K, alkaline, R, red (oxidative deamination), A, acid +, H2S produced, ---, H2S not produced Results • A positive lysine decarboxylase reaction is purple (alkaline) butt, purple slant. A negative reaction is yellow (acid) butt, purple (alkaline) slant. • A positive lysine deaminase reaction is a red slant. A negative reaction is a purple slant. (Proteus spp. and Providencia spp. produce a red slant over a yellow [acid] butt.) • A positive hydrogen sulfide reaction is blackened medium at the apex of the slant. Expiration Refer to expiration date stamped on the container. The dehydrated medium should be discarded if not free flowing, or if appearance has changed from the original color. Expiry applies to medium in its intact container. Limitations of the Procedure 1. Salmonella paratyphi A, unlike other Salmonella spp., does not produce lysine decarboxylase resulting in an alkaline slant and an acid butt. 2. H2S-producing Proteus spp. do not blacken the medium. It is suggested that Lysine Iron Agar be used in conjunction with Triple Sugar Iron Agar or other media to confirm differentiation. 3. The reaction of Morganella morganii may be variable after 23 hours incubation and may require longer incubation. Storage Dehydrated culture media: Store sealed bottle containing the dehydrated medium at 2 - 30°C. Once opened and recapped, place container in a low humidity environment at the same storage temperature. Protect from moisture and light. References 1. Edwards, P. R., and M. A. Fife. 1961. Lysine-iron agar in the detection of Arizona cultures. Appl. Microbiol. 9:478. 2. MacFaddin, J. F. Media for isolation-cultivation-identification-maintenance of medial bacteria, vol 1. Williams & Wilkins, Baltimore, MD. 3. Vanderzant, C. and D. F. Splittstoesser (eds.). 2015. Compendium of methods for the microbiological examination of food, 4th ed. American Public Health Association, Washington, D.C. 4. Flowers, R. S., W. Andrews, C. W. Donnelly, and E. Koenig. 2004. Pathogens in milk and milk Revision: 1 Effective Date: 11/20/2019 products, p. 103-212. In R. T. Marshall, (eds.). Standard methods for the examination of dairy products, 17th ed. American Public Health Association, Washington, D.C. 5. Association of Official Analytical Chemists. 2016. Official methods of analysis of AOAC International, 20th ed. AOAC International, Arlington, VA. Technical Specification Sheet 6. www.fda.gov/Food/ScienceResearch/LaboratoryMethods/BacteriologicalAnalytical manualBAM/default.htm. 7. Finegold, S. M., and W. J. Martin. 1982. Bailey and Scott’s diagnostic microbiology, 6th ed. The CV Mosby Company, St. Louis, MO. Revision: 1 Effective Date: 11/20/2019 .
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